// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/mac/scoped_mach_vm.h"

namespace base {
namespace mac {

    void ScopedMachVM::reset(vm_address_t address, vm_size_t size)
    {
        DCHECK_EQ(address % PAGE_SIZE, 0u);
        DCHECK_EQ(size % PAGE_SIZE, 0u);

        if (size_) {
            if (address_ < address) {
                vm_deallocate(mach_task_self(),
                    address_,
                    std::min(size_, address - address_));
            }
            if (address_ + size_ > address + size) {
                vm_address_t deallocate_start = std::max(address_, address + size);
                vm_deallocate(mach_task_self(),
                    deallocate_start,
                    address_ + size_ - deallocate_start);
            }
        }

        address_ = address;
        size_ = size;
    }

} // namespace mac
} // namespace base
